@badatusernames
In general, the right move, no repotting once active growth starts in spring. I recommend against slip potting, though there are times when it is something that must be done. Generally I try to avoid slip potting.
There is a second repotting season that you may be able to take advantage of. You are in MA, a climate that is not wildly different than mine. After foliage growth and development has slowed down, for me it is about the middle of August, there is a second window of time where one can repot trees. You are in zone 6b, I am in zone 5b. We both get a cooling off at night that begins sometime in August, for me about August 15 night time starts to dip below 65 F (below +18 C ). About this time most trees have a flush of root growth. I repot pines, spruce and a fair number of deciduous at this time of year. I do this repotting Aug 15 to Sept 15. You should finish repotting before the autumnal equinox, as you need time for new roots to establish before winter dormancy.
I have not repotted bald cypress at this time, but I have repotted maples, Chaenomeles, Malus, all my pines including JBP, spruce, Hinoki, and Thuja at this time of year. My success rate is about the same as in spring. So you can consider this. I would repot larch in spring only.
So whether you try this or not, it is up to you. If you live in HOT SUMMER climates, DO NOT DO SUMMER REPOTTING. This is NOT FOR California, Arizona, New Mexico or Texas. The southwest and southern tier of states your climates are far too different to consider this timing. So don't be stupid, if you live in Texas, don't try repotting trees in August. This is a technique for Minnesota thru Maine, Iowa can do it, but most of Missouri is too hot for August repotting. Northern IL it works fine, Southern IL wait until Sept 15, for "summer repotting". So if your area is part of a desert, as in the desert southwest, do not consider this technique.
But if you are in climate zones 6b to 4a there is a possibility of repotting in summer. If you have fewer than 10 days per year over 90 F, (+32 C ). If your summers are relatively mild, middle or late summer repotting is possible. Be sensitive to your local climate, and watch how your trees respond.
If you are in doubt, stick to spring repotting.
Point is, there are at least 2 seasons where repotting can be successful. Actually, with winter protection, there are even more windows of time, but I try to keep my winter protection minimal.
